Revert "Reverting lcov version; it broke Travis CI"
Revert "Reverting lcov version; it broke Travis CI"

This reverts commit 37a8ed02dff96179798c2e3bceeac81912c030e3.

xue2sheng/mountebank,p-equis/mountebank,p-equis/mountebank,njenan/mountebank,bbyars/mountebank,njenan/mountebank,nassimkirouane/mountebank,njenan/mountebank,njenan/mountebank,nassimkirouane/mountebank,nassimkirouane/mountebank,nassimkirouane/mountebank,bbyars/mountebank,xue2sheng/mountebank,p-equis/mountebank